This is a great site tha enables you to create 3D animated cartoons. It's like a cross between Dvolver and Xtranormal.Fantastic. Select different motions for the characters chose backgrounds and add their dialogue.

"Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source. "

Animoto videos - music videos for your images, video clips and pictures. With high production value motion graphics synchronized to every beat of your music, Animoto videos blow the doors off traditional slideshows; it is time to move past the slideshow and embrace Animoto -free, easy, beautiful.